Create CI for ffmpeg in docker (#81)

.github/workflows/ghcr-ffmpeg.yaml

@@ -0,0 +1,57 @@
+name: "Push image to ghcr"
+
+on:
+  push:
+    branches: [master]
+    tags:
+      - v*.*.*
+  release:
+    types: [created]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: wanjohiryan/ffmpeg
+  BASE_TAG_PREFIX: v6
+
+jobs:
+  build-and-push-git-pkg:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    #
+    # do not run on forks
+    if: github.repository_owner == 'wanjohiryan'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Log into registry ${{ env.REGISTRY }}
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Container metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}/${{ env.BASE_TAG_PREFIX }}
+          #
+          #tag on release, and a nightly build for 'dev'
+          tags: |
+            type=raw,value=nightly,enable={{is_default_branch}}
+            type=ref,event=tag
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+
+      - name: Build and push image
+        uses: docker/build-push-action@v4
+        with:
+          context: ./
+          file: docker/ffmpeg/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}